Accession Number:

ADA061943

Title:

The Effectiveness of Some Recent Damping Treatments in the Reduction of the Vibration of Fluid-Loaded Finite Plates.

Descriptive Note:

Master's thesis,

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s):

Report Date:

1978-08-04

Pagination or Media Count:

91.0

Abstract:

The driving-point impedance of center-driven free square plates coated on one side by several commercially available damping treatments have been measured and compared with that of an uncoated, reference plate. The plates were subjected to two types of fluid loading air loading of both sides, and water loading of the uncoated side. Comparison of the resonance frequencies and loss factors provided information about the effects of the damping treatments and the change in the fluid loading on the dynamic characteristics of the plates. Four damping treatments were tested. Of the damping treatments tested, LD400 and Embossed Foam Damping Sheet were found to be the most effective in reducing the vibrations of both the air loaded and water loaded plates. These treatments were seen to cause an increase in the resonant frequencies of the plates. Measurements of the sound level in the direct field of the water loaded plates have shown that these two treatments caused the greatest reduction in the sound radiated by the plates. It is concluded that tile type damping treatments, such as LD400 and Embossed Foam Damping Sheet, are most effective in reducing plate vibrations and sound radiation.

Subject Categories:

  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE